fuller



llnrTnn STnTns FaTnNT muon.

HENRY F. FULLER, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE VALMSLEY, FULLER & COMPANY, OF SAME PLACE.

R E F l., E C T O R.

SPECIFICATION forming part of Letters Patent No. 57 5,473, dated January 19, 1897. Application led ctohe1'31,1896. Serial No. 610,712. (No modelJ To @ZZ whom, t may concern,.- that the reflecting-surface adjacent to the Be it known that I, HENRY F. FULLER, a apex shall have the greatest practicable area. citizen of the United States, residing at Ohi- These results are accomplished bymy invencago, in the county of Cook and State of Illition. Moreover, I prefer to render this sup- 5 nois, have invented a new and useful Implemental reflector pivotally adjustable on a provement in Reflectors, of which the followcenter which should coincide with the focal ing is a specification. center or point in the main reflector, thereby My invention relates to an improvement in to adapt it to be turned to bring a bright secthe class of reflectors in which the relectingtion of its reflecting-surface back of the open- 6o 1o surface is afforded by the inside of a more or ing when the section thereof previously used less flaring body. In every reflector of this there shall have become blurred or smoked. class used for reflecting light from a llame This enables the reflector to be used without an opening is necessarily provided to extend interruption for cleaning, as the blurred or transversely through the reflector adjacent smoked portion of the supplemental reflector 15 to its focal point for the twofold purpose of may be conveniently cleaned when cool after admitting the burner through the base porhaving been turned away from backing the tion and affording a chimney or ventilator for ventilator-opening- The construction thus the escape of the gases, fumes, and smoke generally described enables the attainment evolved by the combustion. For freely carof a short focus and deep reflector, with the 7o zo ryin g off the products of combustion from the latter of comparatively small diameter, thereflame the opening should be comparatively by saving in expense of manufacture and inlarge. Obviously, however, any size of seccreasing the light in proportion to the diamtion removed from the body of the reflector eter of the reflector. to aord the ventilator-opening reduces the Another feature of my improvementrelates 25 extent of rellectingsurface accordingly, and to the provision of mechanism for readily the larger the section the greater the reducchanging the optical focus by moving the tion. burner back and forth with relation to the The primary object of my invention is to focal point in the reflector. provide means for compensating for the loss Referring to the accompanying drawings, 8o 3o of reflecting-surface which ensues from the Figure 1 shows my improved reflector by a,

provision of the ventilator-opening, and this view in side elevation. Fig. 2 is a face view I accomplish through the medium of a supof the same; Fig. 3, a section taken at the plemental reflector supported back of the line 3 on Fig. 2 and viewed in the direction. of

opening to cover it and of a shape adapting the arrow, and Fig. 4. a section taken at the 3 5 it to be struck by the rays or most of the rays line A on Fig. 1 and viewed in the direction of of light from the flame which would otherthe arrow. wise be lost to reflection owing to the provi- A is the flaring hollow metal body provided, sion of the opening. Aperfect parabolic reas usual, with a bright inner surface for reflecting-surface would be one having no openfleeting light, and of any desired general form `9o 4o ings either for the passage of the burner or and construction adapting it for its purpose for ventilation; but as openings for these puras the main reflector, in contradistinction to poses are unavoidable in the forms wherein the supplemental reflector hereinafter dethe burner extends through the wall of the scribed. The body A is shown to be supreflector the best that can be done is to make ported on a frame C of flat metal, represented 45 them as small as the requirements will allow, in the form of a rectangle, to the forward end thus leaving unimpaired as much of the reof the horizontal arm r of which, at a lug fleeting-surface as possible and compensate so thereon, is fastened the body A, through the for the loss due to the openings by means of flange u about its mouth, and at its smaller a supplemental reflector properly disposed. end it is fastened by a screw-bolt t to the up- Ioo 5o It is especially desirable that the apex of the right rear arm r' of the frame C. In the base reflector be left intact, and it is also desirable of the reflector and near its narrower end is formed an opening o, lwhich should be elongated, as shown, for the introduction of the burner B, which I prefer to support adjustably on the frame, as by pivoting it to the arln o" in the manner most clearly shown in Fig. Ll; and the burner carries pivotally a jointed link p, threaded toward its outer ex-.

tremity, where it passes through a tubular thumb-nut p', confined in its bearing in the arm r.

Obviously by manipulating the nut p' the burner may be adjusted back and forth, as desired, with relation to the focal point in the reflector A, which may be at s, to change accordingly the optical focus, or that beyond the instrument.

D is the chimney or ventilator opening, formed directly opposite the opening o in the upper side of the reflector A and as large as properly possible. Behind the reflector A, and centrally supported pivotally, and conlined on the bolt or pin t, is the supplemental reflector Al of the internally-convex shape illustrated, the radius of which Should bear such relation to that of the opening D as to cover it sufficiently to be struck by most if notall of the rays from the flame from the burner, which would otherwise be lost through the opening. By this arrangement of the supplemental reflector no appreciable amount of the rays of light is lost to reflection, and

, its adjustability greatly enhances the convenience of its use by obviating the necessity for any interruption in the working of the apparatus for the purpose of cleaning the supplemental reflector.

What I claim as new, and desire to secure by Letters Patent, is-

l. In combination, a parabolic reflector having an upper Ventilating-opening near its apex and a supplemental reflector adjacent to and behind the said apex to complete the reflectin g-surface,substantially as described.

of, substantially as and for the purpose set forth.

3. In combination witha supporting-frame, a reflector A secured on said frame and having` a base-opening o for the burner and an upper ventilator-opening D, and a supplemental reflector A rotatably supported be-l hind said ventilator-opening, substantially as and for the purpose set forth.

4. In combination, a reflector having an upper Ventilating-opening near its apex, and a supplemental reflector adjacent to and behind the said apex, provided with a reflectingsurface the area of which is in excess of that of the ventilating-openin g and mounted to be shifted to presen-t different portions thereof to the said opening,substantially as described.

5. In combinationwith a reflector provided with an opening in its wall, a pivotally-supported burner extending through said opening, and means for adjusting the burner on its pivotal support to vary the focus, substantially as described.

G. In combination with a supporting-frame, a reflector A secured on said frame, and having an opening in its wall, a pivotally-supported burner B extending through the opening into said reflector, and a rod connection p between the burner and frame, provided with an operating-nut p, substantially as and for the purpose set forth.

IIENRY F. FULLER.

In presence of- J. W. DYRENFORTH, R. T. SPENCER. 

